克拉玛依市乌尔禾区农田土壤重(类)金属污染特征及生态风险评价

摘要

A total of 46 soil samples were collected from farmland soils in Urho District of Karamay City, and the contents of 5 heavy metals (Cd,Pb,Cr,As,and Hg)in farmland soils were analyzed evaluation of heavy metal (metalloid)pollution characteristics and ecological risk of farmland soil was carried out by u-sing the single factor index method,Nemerow index method and potential ecological risk assessment meth-od,respectively.The results showed that the Cd and Cr single factor pollution index of farmland soil sam-ples in the study area was greater than 1 ,and both of these heavy metal elements had a certain cumulative phenomenon.The Cd average pollution index was far higher than the Cr average pollution index,and the cumulative trend was most obvious.The Nemerow index method showed that Mere pollution index in soil heavy metals (metalloid)was 3.19 on average,belonging to severe polluted.In the study area,the compre-hensive ecological risk index of 5 heavy metals (metalloid)in farmland soil was 45.65％ in low potential ecological risk and 54.35％ in medium potential ecological risk.%以克拉玛依市乌尔禾区农田土壤为研究对象,在研究区共采集46个土壤样品,分析农田土壤中5种重(类)金属(Cd、Pb、Cr、As、Hg)的含量,分别采用单因子指数法、内梅罗指数法和潜在生态风险评价法评价农田土壤重(类)金属污染特征及生态风险.结果表明,研究区农田土壤样品Cd和Cr单因子污染指数均大于1,这两种重金属元素均存在一定的累积现象,其中Cd平均污染指数远高于Cr平均污染指数,累积趋势最为明显.内梅罗指数法显示土壤重(类)金属内梅罗污染指数平均值为3.19,属于重度污染.研究区农田土壤5种重(类)金属综合潜在生态风险指数处于低潜在生态风险的占45.65％,处于中等潜在生态风险的占54.35％.